Gives abstract characterizations of unitary operators U and subspaces L0 where the corner operator P_L0 U restricted to L0 has a singular value decomposition, plus relations to pairs of projections and concrete examples.
Hartman, On completely continuous Hankel matrices, Proc
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Unitary operators with decomposable corners
Gives abstract characterizations of unitary operators U and subspaces L0 where the corner operator P_L0 U restricted to L0 has a singular value decomposition, plus relations to pairs of projections and concrete examples.